package com.lagou.service;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 * @author 123
 * @date 2020/5/15 14:25
 * @description
 */
@Component
public class SpringContext implements ApplicationContextAware {

    // Spring应用上下文环境
    private static ApplicationContext applicationContext;

    /**
     * 实现ApplicationContextAware接口的回调方法，设置上下文环境
     */
    public void setApplicationContext(ApplicationContext applicationContext)
            throws BeansException {
        SpringContext.applicationContext = applicationContext;
    }

    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    /**
     * 获取对象 这里重写了bean方法，起主要作用
     *
     * @return  Object
     * @throws BeansException
     */
    public static Object getBean(String beanId) throws BeansException {
        return applicationContext.getBean(beanId);
    }

    public static Object getBean(Class clazz) throws BeansException {
        return applicationContext.getBean(clazz);
    }
}
